Digital Fluoroscopy Flashcards
(31 cards)
What is digital fluoroscopy?
An advancement in medical imaging technology that builds upon traditional fluoroscopic principles while incorporating digital processing capabilities
How does digital fluoroscopy differ from conventional fluoroscopy?
By connecting image data directly to computer processing systems.
What are the key advantages of digital fluoroscopy?
- Rapid image acquisition and processing
- Advanced image manipulation capabilities
- Digital storage and retrieval
- Enhanced image quality through post-processing
- Reduced radiation exposure through optimization
What are the timing elements of high frequency generators in digital fluoro?
- Interrogation time
- Extinction time
- Duty Cycle
What is interrogation time in digital fluoroscopy?
The time required for the tube to reach set kVp and mA levels, lasting less than 1 millisecond.
What is the duration of interrogation time?
Less than 1 ms
What is the importance of interrogation time?
Affects the image acquisition speed
What is extinction time in digital fluoroscopy?
The time needed for tube deactivation, also lasting less than 1 millisecond.
What is the necessity of extinction time?
Its critical for pulsed fluoroscopy operation
What does duty cycle refer to in digital fluoroscopy?
The active tube operation time which impacts patient dose and image quality.
What is the tube current difference between digital and conventional fluoroscopy?
Digital: hundreds of mA;
Conventional: 0.5 - 5 mA.
What attributes to the difference in tube current between digital and conventional fluoro?
Pulsed operation mode in digital
What is the purpose of pulsed progressive mode in digital fluoroscopy?
To reduce radiation dose through rapid on/off switching.
What is the pulse width in pulsed progressive mode?
3-10 milliseconds.
What are the benefits of pulsed progressive mode?
Reduced patient exposure while maintaining image quality
What are the two image detection systems in Digital Fluoroscopy?
- Charged Couple device (CCD)
- Flat panel detector (FPD)
What are the basic operations of the CCD system?
- Captures light from II tube output phosphor
- Converts light to electrical signals
- Processes through Analog-Digital Converter (ADC)
What are the advantages of CCD over traditional TV cameras?
- Higher Signal-to-Noise Ratio (SNR)
- Improved contrast resolution
- Better overall image quality
What are key features of Flat Panel Detector (FPD) systems?
- Direct replacement for II tubes
- Uses CsI/a-Si (indirect version)
- Lighter and more maneuverable
What advantages do FPD systems offer?
- Distortion-free images
- Consistent image quality across the field
- Enhanced contrast resolution
- High DQE at all radiation levels
- Rectangular image area
- Immunity to magnetic interference
What is the data management specification for uncompressed images?
2 bytes/pixel.
What are the available matrix sizes for image specifications?
- 512 x 512 = 0.5 MB/image (15 MB/sec at 30 fps)
- 1024 x 1024 = 1.0 MB/image (30 MB/sec at 30 fps)
- 2048 x 2048 = 4 MB/image (120 MB/sec at 30 fps)
What factors determine file size in digital fluoroscopy?
- Acquisition matrix
- Acquisition rate
What makes file sizes more manageable?
Binning Dels
